Excel Online Structured Activity: Descriptive Statistics and Finding Common Measures of Location Sample data typical of the cost of tax-return preparation by services such as H&R Block are located in the Microsoft Excel Online file below. Use the spreadsheet to answer the following questions. ***** Open spreadsheet a. Compute the mean, median, and mode. Round your answers to one decimal place, if necessary. Mean Median Mode b. Compute the first and third quartiles using Excel's QUARTILE.EXC function. Round your answers to one decimal place, if necessary. 112.5 252 149.7 125 125 Qi Q c. Compute the 90th percentile using Excel's PERCENTILE.EXC function. Round your answers to one decimal place, if necessary. 100 Cost 120 215 110 115 160 130 150 105 200 155 105 350 120 120 145 100 115 185 235 255 Mean Median Mode + Q1 Q3 90th Percentile Formulas Used #N/A #N/A #N/A #N/A #N/A #N/A